ABSTRACT

　Objective: Although body weight is used for routine physical conditioning, it is desirable for athletes to be able to routinely measure total body water（TBW） content, which correlates with skeletal muscle mass. Body composition changes during pregnancy were documented in para-athletes who continued training during pregnancy in order to return to competition after childbirth.

　Methods: Body composition was measured once a month during an outpatient visit and compared with the TBW calculated using a body water meter（BWM） developed to easily calculated TBW on the upper arm.

　Results: TBW showed an increase until 20 weeks gestation, then decreased once, and increased in the third trimester. TBW on BWM was almost constant and showed similar changes to the changes in body water content in the upper rim. Consideration: Because she continued to train throughout her pregnancy, her weight in the third trimester was considered to be almost constant, a pregnancy in which she was able to manage her weight properly. Weight gain in the first half of pregnancy showed an increase in intracellular water content, although an increase in fat mass was observed. A decrease in fat mass and an increase in TBW were observed in the third trimester. This was mainly an increase in extracellular body water content, which was thought to be an increase in amniotic fluid, and an increase in trunk water content.

DECENTE SPORTS SCIENCE Vol.45/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE